export interface GasBushitsuSendOptions {
    endpoint: string;
    room: string;
    userName: string;
    /**
     * Custom fetch function. Defaults to `UrlFetchApp.fetch` when available.
     */
    fetchFn?: (url: string, params: GasFetchRequest) => unknown;
    /**
     * Additional HTTP headers to include in the request.
     */
    headers?: Record<string, string>;
    /**
     * HTTP method to use. Defaults to `post`.
     */
    method?: string;
    /**
     * Content type for the request payload. Defaults to `application/json`.
     */
    contentType?: string;
    /**
     * Allows overriding the payload structure.
     */
    payloadBuilder?: (input: GasPayloadBuilderInput) => string | Record<string, unknown>;
    /**
     * Whether to mute HTTP exceptions. Defaults to `true`.
     */
    muteHttpExceptions?: boolean;
}
export interface GasFetchRequest {
    method?: string;
    contentType?: string;
    headers?: Record<string, string>;
    payload?: string;
    muteHttpExceptions?: boolean;
}
export interface GasPayloadBuilderInput {
    text: string;
    mentionTo?: string;
    room: string;
    userName: string;
}
export interface GasBushitsuSendOnlyClient {
    sendMessage: (text: string, mentionTo?: string) => unknown;
}
export declare const createGasBushitsuMessageSender: (options: GasBushitsuSendOptions) => GasBushitsuSendOnlyClient;